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Unix Version 7 - man page for uniq (v7 section 1)

UNIQ(1) 			     General Commands Manual				  UNIQ(1)

       uniq - report repeated lines in a file

       uniq [ -udc [ +n ] [ -n ] ] [ input [ output ] ]

       Uniq  reads  the  input file comparing adjacent lines.  In the normal case, the second and
       succeeding copies of repeated lines are removed; the remainder is written  on  the  output
       file.   Note  that  repeated lines must be adjacent in order to be found; see sort(1).  If
       the -u flag is used, just the lines that are not repeated in the original file are output.
       The  -d	option	specifies that one copy of just the repeated lines is to be written.  The
       normal mode output is the union of the -u and -d mode outputs.

       The -c option supersedes -u and -d and generates an output report  in  default  style  but
       with each line preceded by a count of the number of times it occurred.

       The n arguments specify skipping an initial portion of each line in the comparison:

       -n      The  first  n fields together with any blanks before each are ignored.  A field is
	       defined as a string of non-space, non-tab characters separated by tabs and  spaces
	       from its neighbors.

       +n      The first n characters are ignored.  Fields are skipped before characters.

       sort(1), comm(1)


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